/Engine/Source/Runtime/MovieScene/Public/MovieSceneClipboard.h
A key in the clipboard representing a time and a value of a specific type Client code must define MovieSceneClipboard::GetKeyTypeName<> in order to use a type with this class. In general, keys are stored relaative to the minumum key-time in the clipboard, or some arbitrary time. This cardinal time is stored with the clipboard environment.
class FMovieSceneClipboardKey